Saint Clair County Weather Today — Illinois, United States
Current temperature, rain chance, humidity, wind and air quality in Saint Clair County, plus an hourly and 3-day forecast. Updated through the day.
04:40
Sat, 19 Sep 2026
📍 Illinois, United States
Saint Clair County??
13
°C
Clear
Feels 11°C · 55°F
💧 54% Humidity
💨 ↖ 18.7 km/h NW
👁 10 km Visibility
🌧 0 mm Precip
☁ 0% Cloud
☀️ UV Low
🌿 AQI Good
☀️ UV Index
0
Low
🔵 Pressure
991
hPa · 29.26 in
💨 Wind
18.7
km/h · Gust 34.6 km/h
↖ NW
💧 Humidity
54%
Dew point 6°C
👁 Visibility
10
km · 6 miles
🌡 Heat Index
11°
Wind chill 8.8°C
🌿 Air Quality
Good
US EPA Index: 1
🌅
Sunrise
06:32 AM
🌇
Sunset
06:31 PM
📅 3-Day Forecast
Saturday
19 Sep 2026
Overcast
14°
/
6°
💧71%
🌧3.55mm
💨55
☀️UV 3.4
Sunday
20 Sep 2026
Patchy rain nearby
10°
/
5°
💧75%
🌧3.83mm
💨66
☀️UV 4.4
Monday
21 Sep 2026
Overcast
17°
/
7°
💧68%
🌧6.53mm
💨45
☀️UV 4.4
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